Ay oo naman, yan ang normal pattern talaga ng babies, they get all excited and stimulated, tapos biglang crash sila when their system overloads na, kaya ang yawning at pagtulog agad! A few of us mums notice this especially after active playtime, so what we do is we give them a quiet wind-down time, soft talking, less bright lights, before nap time kaya smoother ang transition instead of that sudden energy drop. Pero if you're noticing he's getting too lethargic or the pattern feels off compared to usual, might be worth checking in with your pedia lang to be sure everything's on track!